package com.swfee.qinben.util;

import android.view.View;
import android.view.ViewGroup;
import android.widget.ListAdapter;
import android.widget.ListView;

public class Utility {
	    public static void setListViewHeightBasedOnChildren(ListView listView) {
	            //获取ListView对应的Adapter
	        ListAdapter listAdapter = listView.getAdapter();
	        if (listAdapter == null) {
	            // pre-condition
	            return;
	        }
	 
	        int totalHeight = 0;
	        for (int i = 0, len = listAdapter.getCount(); i < len; i++) {   //listAdapter.getCount()返回数据项的数目
	            View listItem = listAdapter.getView(i, null, listView);
	            listItem.measure(0, 0);  //计算子项View 的宽高
	            totalHeight += listItem.getMeasuredHeight();  //统计所有子项的总高度
	        }
	 
	        ViewGroup.LayoutParams params = listView.getLayoutParams();
	        params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() - 1));
	        //listView.getDividerHeight()获取子项间分隔符占用的高度
	        //params.height最后得到整个ListView完整显示需要的高度
	        listView.setLayoutParams(params);
	    }
	 
	}